MEDM - Motif Editor and Display Manager
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MEDM is a graphical user interface tool for designing and implementing control
screens for EPICS-based control systems. Displays contain graphical objects that
can display and/or change the values of EPICS process variables using the
Channel Access network protocol. Supported graphical objects include buttons,
meters, sliders, text displays/entries, and graphs.

MEDM has two modes of operation, EDIT and EXECUTE. Displays are created and
edited in EDIT mode, and run in EXECUTE mode.

More information about MEDM can be found via its web-page on the EPICS site:
    http://www.aps.anl.gov/epics/extensions/medm/index.php


The extension distribution file should be unziped and untared
in the extensions/src directory.

By "extensions/src directory" is meant the src folder inside a special kind of directory called the extensions directory, created with the makeBaseExt.pl command. Learn more about extension directories here:

https://epics.anl.gov/extensions/configure/index.php

Also, you may need to edit the relevant CONFIG_SITE file in the extensions/os/configure directory, in order to set MOTIF_LIB and X11_LIB to point to the correct path on your machine. For example, if you run 64-bit linux, you may need to edit extensions/configure/os/CONFIG_SITE.linux-x86_64.linux-x86_64